// Copyright 2010 Steven Dee. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

goog.provide('dbv');


dbv.Debugviz_ = function() {
  this.listeners_ = [];
};

dbv.Debugviz_.prototype.getListeners = function() {
  return this.listeners_;
};

dbv.getInstance = function() {
  if (!dbv.instance_) {
    dbv.instance_ = new dbv.Debugviz_();
  }
  return dbv.instance_;
};

dbv.reset = function() {
  this.instance_ = null;
};

dbv.begin = function() {
  this.oldListen_ = goog.events.listen;
  var oldListen = this.oldListen_;
  goog.events.listen = function() {
    var id = oldListen.apply(null, arguments);
    dbv.getInstance().listeners_.unshift(id);
    return id;
  };
};

dbv.end = function() {
  goog.events.listen = this.oldListen_;
};

dbv.getListeners = function() {
  return [];
};
